图示电路中求反激电路最大功率率

求下图电路中,负载电阻RL获得的最大功率.
Lonely831dg
如图,用戴维南定理求出网络的等效电势 Uab,内阻 Rab ,RL = Rab 时,RL获得最大功率.Uab = 8 + 4 * 2 = 16 V & & & ;开路,I = 0 ,4I = 0 .A、B 短路:(4 * Isc - 8)/ 2 = 4 - Isc & & & & & ;竖向 2Ω 的电流.Isc = 8/3Rab = Uab / Isc& & & & = 6 ΩRL = 6Ω 时获得最大功率 Pmax:Pmax = 8 * 8 / 6 & & & & & & ;UR = Uab / 2 .& & & & & = 10.667 W
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4分之1瓦到1瓦
扫描下载二维码求图示电路中电阻RL为何值时功率最大,并计算最大功率&
这题主要考的是戴维南等效定理将RL电阻断开,计算UeqRL断开后,电路等式为0.5I1+1=I1计算I1=2AUeq=0.5*2*2+2*1=4v设将RL用电源Us替代,电流为Is,电流源断开列方程:4Is+(0.5I1+Is)*3=UsI1=0.5I1+Is那么Req=Us/Is=10Ω即当RL=10Ω的时候功率最大,最大功率为P=Ueq²/(10+10)=0.8W
我算的是0.4瓦啊
那看你算出来的Ueq和Req对不对
电压是Ueq=0.5*2*2+2*1=4v,这样算出来的最大功率为P=Ueq²/(10+10)=0.8W
你帮忙看一下。。
你这样算很麻烦,其实这道题的考点就是戴维南等效定理,你用节点电压法去算的话增加了计算量,又违背的题目的本意。或者你再算一下RL两端的等效电压看看
目前就会节点电压法啊
这个解法对不对啊。。。。
是我搞错了,最后是2个电阻串联,有个电阻分压了,P=2²/10=0.4W,不好意思
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扫描下载二维码如图所示,U-I图线上,a、b、c各点均表示该电路中有一个确定的工作状态,b点α=β,则下列说法中正确的是(  )
A.在b点时,电源有最大输出功率
B.在b点时,电源的总功率最大
C.从a→b时,β角越大,电源的总功率和输出功率都将增大
D.从b→c时,β角越大,电源的总功率和输出功率都将增大
A、b点α=β,故定值电阻R和电源的内电阻r相等,此时电源的输出功率最大,故A正确;B、电源的总功率P=EI,故a点对应的功率最大,故B错误;C、从a→b时,电源的总功率P=EI减小,而输出功率变大,故C错误;D、从b→c时,电源的总功率P=EI减小,而输出功率变小,故D错误;故选A.
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a. that    b. this    c. it    d. they
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a. It"s    b. They"re    c. That"s    d. This is 
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旗下成员公司13.图示电路,Rl可变,求Rl为多少时获得最大功率,并求出最大功率值_百度知道
13.图示电路,Rl可变,求Rl为多少时获得最大功率,并求出最大功率值
//c.jpg" esrc="http.baidu.baidu.jpg" target="_blank" title="点击查看大图" class="ikqb_img_alink"><img class="ikqb_img" src="http.hiphotos.hiphotosUab = 12VRab = 2Ω当 RL = 2Ω 时获得最大功率.baidu://h.jpg" esrc="http.hiphotos.jpg" target="_blank" title="点击查看大图" class="ikqb_img_alink"><img class="ikqb_img" src="/zhidao/wh%3D450%2C600/sign=226fc5c1/83025aafa40f4bfb8c79dcf63618c2://h.baidu://h.com/zhidao/wh%3D600%2C800/sign=7f6e264faf2e//zhidao/pic/item/83025aafa40f4bfb8c79dcf63618c2.baidu.hiphotos
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